The turbidity variation in artificial water and samples from a water plant was investigated in the presence of organics with different relative molecular mass.The results show that recessive turbidity existed when water chemical conditions were changing.The formation of turbidity depen-ded on organic relative molecular mass and their conforma-tions on particles.At higher pH and lower ionic strength,the organic chains with a more extended conformation resulted in rising turbidity of the suspension.At lower pH,the reconfor-mation of organics took place due to charge neutralization by the proton,resulting in a decline in turbidity.The addition of NaCl and MgCl_(2) at pH 7.00 also resulted in a decrease of turbidity in the suspension.It is believed that the occurrence of recessive turbidity has a significant influence on the stability of water supply quality.
